Gestational age

    Gestational age relates to the age of an embryo or fetus (or newborn infant). There is some ambiguity as to how it is defined: In embryology, the term “gestational age” is seldom used because it lacks precision. The timing of embryonic development starts with fertilization. In mammals, this proceeds through uterine implantation, until birth. In human obstetrics, gestational age is often defined as the time elapsed since 14 days prior to fertilization.

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